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Posted to issues@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2014/05/31 03:23:01 UTC
[jira] [Updated] (DRILL-883) Wrong result when projecting certain
columns if subquery and outer query have the same table
[ https://issues.apache.org/jira/browse/DRILL-883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aman Sinha updated DRILL-883:
-----------------------------
Assignee: Jacques Nadeau
> Wrong result when projecting certain columns if subquery and outer query have the same table
> ---------------------------------------------------------------------------------------------
>
> Key: DRILL-883
> URL: https://issues.apache.org/jira/browse/DRILL-883
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Aman Sinha
> Assignee: Jacques Nadeau
>
> In the following query, projecting n_regionkey in the outer query produces wrong results. The outer query and subquery both reference nation table, although they should be separate instances. Note that the Scan of nation in the outer query is project the wrong column (n_nationkey instead of n_regionkey). That's causing the wrong results. One other observation: disabling the push project into scan rule gives correct results.
> 1 row selected (0.344 seconds)
> 0: jdbc:drill:zk=local> explain plan for select n1.n_regionkey from nation n1, (select n_nationkey from nation) as n2 where n1.n_nationkey = n2.n_nationkey;
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 UnionExchange
> 01-01 Project(n_regionkey=[$2])
> 01-02 HashJoin(condition=[=($1, $3)], joinType=[inner])
> 01-04 HashToRandomExchange(dist0=[[$1]])
> 02-01 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/Users/asinha/data/tpchmulti/nation]], selectionRoot=/Users/asinha/data/tpchmulti/nation, columns=[SchemaPath [`n_nationkey`]]]])
> 01-03 Project(n_nationkey0=[$0])
> 01-05 HashToRandomExchange(dist0=[[$0]])
> 03-01 Project(n_nationkey=[$1])
> 03-02 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/Users/asinha/data/tpchmulti/nation]], selectionRoot=/Users/asinha/data/tpchmulti/nation, columns=[SchemaPath [`n_nationkey`]]]])
> 0: jdbc:drill:zk=local> select n1.n_regionkey from nation n1, (select n_nationkey from nation) as n2 where n1.n_nationkey = n2.n_nationkey;
> +-------------+
> | n_regionkey |
> +-------------+
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> | null |
> +-------------+
> 25 rows selected (0.538 seconds)
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